摘要：
Ayoub thinks that he is a very smart person, so he created a function f(s)f(s) , where ss is a binary string (a string which contains only symbols "0" 阅读全文
摘要：
0.注意爆int有可能是ans+=(long long)a[x]*b*2;像这种语句如果没加(long long)就会升天。 1.看清数据范围，不开long long见祖宗。 2.不要乱用指针。 3.memset不要乱用，可能会T，同时不要用它初始化double数组等等。 4.每个test case 阅读全文
摘要：
Freddy Frog is sitting on a stone in the middle of a lake. Suddenly he notices Fiona Frog who is sitting on another stone. He plans to visit her, but 阅读全文